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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20365c8f3df2ec6bb634f47cf8468a2642eb065b5703b427add817fa21b4ac74' 
  AND token = 'fIUsPcJ71DEylTtT/NG52YiuW2NkeGRLn1+nVJxnU2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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