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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9f1c472fb5697786603a2b3d7c558d92fc1469191deaa6cbd5939c12c9ed8e' 
  AND token = 'FE0Eb3ziEON6Rjk5ru+P/mjc73zjOFJYTa8+9mPfFgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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