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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb9189d7133e8fdc0006b5cd93ec42175d0ef1d1b79bac0dc6c690c634e6366' 
  AND token = 'n24yhfL3gCChHRSD6bb7+zKNIQX59qkHzXN/CC+BV0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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