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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc43d02b2b2305000707bc2c793caa9d64b94e5fc646e35607cfce7642c14fd' 
  AND token = 'RwK3NjjxBJy5gH4o8zA3kJJ4bgUHScHe9roQhTi0wZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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