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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71d3461f29e3efa3bad92fe7f4d7a1abf28469454f71bc6b3ed909bc036cd50' 
  AND token = 'dkSHWwC0mxjWOnOBPJYol52Y3fzt2Ip08qAGds+U3BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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