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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7945712b3315dddd1090a3cf10a70a589c27d95dda51b8b158d18b6914c7eb93' 
  AND token = 'm3agsrfomVI8sOhkm6h5dWE9hMNthoYRw2ht/t6aWSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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