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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07ce5796fef248d8e1fa621588049e1b4af6f6031b3faa40084ae7e48fa577e' 
  AND token = 'mOafhE+du2BfhmOtHA3d1vZq4jCXo/qoJ2qI4hESXMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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