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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598d0014e81f9ee689b98b139c315c50edcd830559df28bbf0765c8f46d4f124' 
  AND token = 'FV/z6umPCA0ucRlfYNtfca/gagfASxNXboPUKuBVePE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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