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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c451a7b34f6180e5c9a76596e378c82ad6479607443708a9cf4ba511679f2650' 
  AND token = '1wgiM7dIX7LqZOlhxg1qn2aEGprdFLG7gE47IcJ6zCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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