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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '850ff8f73909725f5de4b85f67d96513bf83b2fac7630460f76087164353a62c' 
  AND token = 'GaJEm8kzlFwLcmoWBcw8f06pcUQ/XsbXEmkVxJI//Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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