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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cea600983bce9138d6e9e19a8a196d7ead7fe4045c6c03a695880240c1af60' 
  AND token = '71/ylSMn3qXLPVRb76GTY8W2WZGlNA8QWp9cBMNVhMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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