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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b83c249f29072073bb41f0a26b54d40900f862675c2b94d3fff579f95c5101' 
  AND token = '46M2OFQtmje4+vY0hjAogcPbjuqQG+0mhpFSEt0JWmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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