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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64089f5f5ac0c40c91b65aab1af5f0844528c702f9748ebf1544328085896b22' 
  AND token = 'TaG+0x8bGofAVo7IZmjg6BXZgNPdXHoD0hUjuMIB5Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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