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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4fd9c73eef5fb37305a1f658e50d8f8a455f4b150a608d6855feb65a3e4a64c' 
  AND token = 'fmLo7yUoLE59oc9hMMMQMMNfqJ1sQykMifFX4Gj0YD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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