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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c6485f654e39305e4da8d2115d2a527741571790e711a1d14c6010afff7a811' 
  AND token = 'r2bTKEjAyG9kZ6JiAPb3qIh6UkeIQrKxRgoe2FTaGe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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