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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '252e18d15431015c5f3a6acd7a080e08f9a72da3498d4742c7ef2a432bd2f470' 
  AND token = 'T99qNJDSg+r1zSsO/V8QhI8uXJue+LwfgNDEIursVWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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