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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e776a61ab7194b72fc2cf844f9bfbcbd922aa690965d90e59beb9120cbbd86' 
  AND token = 'jqzssmAnRAIddEgBZekwBR2bAljDlvAh2DR6oW2IR+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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