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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0814ac0f8f5dd0e9422dda823b6a95c88368a058283197a1ae6a50950e52cd08' 
  AND token = 'y8wxt0eLpGSTx5L4E8nWR+f89VF2ba+rRqbOyOzJjls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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