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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32148a68e481d9df97c7f2f0018499c5a37cd4115878aafa1309dc8e7d909617' 
  AND token = 'BenXPcldQDRgkyXW4fKvbKaGFQKtboj9YAxF53pPqRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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