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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5efa7350c2edc17134da21eac5a686a93e50109337ec2930a2560668bb5309b' 
  AND token = 'SSFXtDBpxsOhCBMb28nzjngR5nsUpPY229gx2dUnTVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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