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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5d5a1eabe874cf44264379ff90870c949df2c474f84acb2c8d0da5c2363069' 
  AND token = 'no0elcMpK5bY50CClwq9Uegc+T0T/uJnrFoD+vOluS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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