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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa1b2dab972c7f79d4fb6012aec05d991b0c01be4993ec00933400186f1003e' 
  AND token = '7FL62BcCe4W2B/tV7q2HpFozQcJgOaVN4s1xv4WUcEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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