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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c534b4746444be92900532984d0acae40e182ff335ec5f785f4173a827189fd0' 
  AND token = '7b5zB6Zjw7uDsJ8LXRB6BYfAS12ixFaE95j5MfxydKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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