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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d9d6eee28b8a6c6638d0600f79f5d0d919a0f67f16125e3db1a2ec7a1e317c' 
  AND token = '54PHBIQlC6iaXNFi1rkpC3s1c3ZQJzSSO/5ltRZyz30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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