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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd9904f3002d15b96123c27ecf5e3c0ba65aa97c050c719830331daffaf706b' 
  AND token = 'CppzSgXOdxiXiX+NFuduK8nQ6r9pDiSKeuIBwf58m7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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