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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95528ad213eb7d0f4af92a60a50628782554fa98f0383c0278c78e73dcdf7ed' 
  AND token = '/38Lpc3wb2qWn6yE3YyWVOYaa123vbU9c45IjtCDdGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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