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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ef8ad3fb2ec0baf9d312f9bcd4a319bfe975953491ffd7023782a317e5f10f' 
  AND token = 'Tttk9Z2PrusLBolg5f01/QQIjvSBbolMpbO+9bLY0EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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