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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c3d5f986ae2c8d6ffd78a5011e217e02e614d487a0a744ed7359ed3254d99f' 
  AND token = 'dSFX/zw3KKaTDYfjnaXFyVtRtHDDmpOZlufpYM9v39E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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