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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91aee5f2e99cbf7ad22a3970bdee41c6e4028dcd6cf6efca03f9ea9b1346d39c' 
  AND token = 'rDy+huzOO/Y8Y7htrzUVcItxBV6TVI3legJbFnNacKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}