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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed51b3ffde5608e232c04607467305f3cd45f6b178dd1a733e98ab2fd9cdd8bd' 
  AND token = 'aAsj9jyNn5cHBOe8ctIJfBlf21wgRHuBvTMMY7qcWtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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