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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14bb811af1eb2b5680ebf85e50e65b20ebef8b2e113f0ddf3d9798e84ce568e8' 
  AND token = 'zEtzM6gwVEEjR+UOS3mn68CJKUOXe8m9rdXzf8911vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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