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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff23e412c0f4b5cf581a59a950c613fd3028f904801820699172bfef6a65b154' 
  AND token = 'DNXfhfVH5JxZjGGXoi4Q6SWrVBQ6Rruzxob7lccurBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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