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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3ad78364a0c535a2c4d96da3ceba31a2c0e52ac2cc5124f24c48d2352434f0' 
  AND token = '7Maz9ycOpKKhZlXx+gdZAyXBhs3sc5zm4cayDF26aJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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