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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619bf07ec08c2d73016eab794b3c8eb43bde0efadca2c29ad75751e7ad2b3641' 
  AND token = 'EqR1Ppd34I7+8mX2dZ4eZ4jU7cL22BhtZivP858hfU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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