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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8437b3c08d9ce6f5be89376243d823d4cfb068257be02250c28e0186713ca445' 
  AND token = 'HO2knCFfP2ZvAV6RvKPIKAtu4nfjWuE8oG5yfoj6t00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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