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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a0544351179a93753f53e0aa129615a6c57a8a694c2da8c7dcd7347ce1b2c1' 
  AND token = 'bgjZg0Z4pW0lvXjaYYAGpqsbXxsv3au6EJqf0rr2+As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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