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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea02e5cb32401443b9cc79dde893eb93d3a666124b16ef794ca6d983646c9817' 
  AND token = 'CdT4R+YM+QZmg0rDYAe6tzNVSR0YUWw/+2nAyHtMukQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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