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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef96d3e404e15321f87a07d0520129e214c94a4c6975263fb22e11e56267db0f' 
  AND token = 'KbSpsSD+pjepacV79tPtAknWqALAVam16U7tJgGm2ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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