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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460b8953d45900eb8b449fdb18eb45f8fe2eea3957f1a6d259d251f9b4a38a02' 
  AND token = '0IIZsQBM1qq4WDq8cDdeopIg+4iqJT08rhkCCP8JSc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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