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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e812d4a162aa509464d7ff03c8f62a1e0ac3279fe9067836d3fc748e6452dc86' 
  AND token = 'npLREKY/dFCOuuA5XP45U0YwWmgayubTii9tXRjHMmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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