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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de456c11a837cc4c1b37d388c14c5bc823de3f6c26146c465564d312b5410227' 
  AND token = '25LXfzqnG0CA9flI+2yggA41n8Aqlt9HqmGF33UgYn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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