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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8f1d3f0fbc07c647f425375ff8c6148f956077f7fcc47f9c0509de251f9010' 
  AND token = 'r8GJTShduaI0SQ6APInp17ygCYOA3PvhjTOrw1U8fS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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