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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773d5afd2b63cc6534a22a237e5b732cc6c4090bcd346096e6c4fb2b21451d5e' 
  AND token = 'm76tFWreiBJF7GFD7AxIX3Bcbi4y9Ll+7aH1Fmq4Mj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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