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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a6def6ec717686226d0cbf6fd1ead1561cf49df4085f25136b94825af73148' 
  AND token = 'ODodFRLtHJCAeyqzKGVJs0dPufvZ//jN+m5c6o9uffo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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