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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e65a82e31ab58563f0ddbbcc4deab1a5f630e8f493cd6f9a6cafa0510d8603' 
  AND token = 'By7m38+G8hcO6Bi9wZbcbF7wolAiND7bn8mNlEobj0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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