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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd02d0ab3c9d1a0f3c988c8cc62d8f0a495ebc8f0da834efdc5ce710f509528d3' 
  AND token = '2Xf+6eC9TrdrsTInYenjFxcGFhsNPT0yDKhmU5FcodY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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