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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ab854234ee963646d0f2f6c0ededcd20c8b6334867a38f4123af2e89df12b7' 
  AND token = 'DstHmVKBKSFynCyrrgOwXYIyHFOZrb3e1cd+dtSWSD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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