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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f0d739b2d6ef7478bbc685b99b3a925a0532d7daf1549c80c9ebe4865d4b09' 
  AND token = 'TZjCYpH5yVP0vcu30OUKo4HxSxjYxu080io1oWisH+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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